Doh! That’s because I unpublished it for a while. I’m trying out Kindle Direct Publishing Select for a little while. In order to enroll in that program, the book cannot be listed anywhere else, so I removed it from Smashwords. Its still available on Amazon for 99 cents and from 16-18 December and 25-26 December I will list it at no cost on Amazon. The book was getting a few downloads every other day on Smashwords (predictably – it was free there), but no real movement on Amazon. It will eventually return to Smashwords, but I want to experiment with KDP Select for a bit.
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